Package gavo :: Package stc :: Module common

Module common

Definitions and shared code for STC processing.

Classes
	STCError
	STCSParseError is raised if an STC-S expression could not be parsed.
	STCLiteralError is raised when a literal is not well-formed.
	STCInternalError is raised when assumptions about the library behaviour are violated.
	STCValueError is raised when some STC specification is inconsistent.
	STCUnitError is raised when some impossible operation on units is requested.
	STCXBadError is raised when something is wrong with STC-X.
	STCNotImplementedError is raised when the current implementation limits are reached.
	ASTNode The base class for all nodes in STC ASTs.
	ColRef A column reference instead of a true value, occurring in an STC-S tree.
	GeometryColRef A ColRef that refers to an in-DB geometry.

Functions

clampLong(val)
returns val standardized as a latitude.

source code

clampLat(val)
returns val standardized as a latitude.

source code

Variables
	TWO_PI = `6.28318530718`
	tropicalYear = `365.242198781`
	secsPerJCy = `3155760000.0`
	STCNamespace = `'http://www.ivoa.net/xml/STC/stc-v1.30.xsd'`
	XlinkNamespace = `'http://www.w3.org/1999/xlink'`
	stcSpaceRefFrames = `set(['AZ_EL', 'BODY', 'ECLIPTIC', 'FK4', '...`
	stcRefPositions = `set(['BARYCENTER', 'CoordRefPos', 'EMBARYCEN...`
	stcCoordFlavors = `set(['CARTESIAN', 'CYLINDRICAL', 'HEALPIX', ...`
	stcTimeScales = `set(['ET', 'IAT', 'LST', 'TAI', 'TCB', 'TCG', ...`
	__package__ = `'gavo.stc'`

Function Details

clampLong(val)

source code

returns val standardized as a latitude.

Our latitudes are always in [0, 2*pi].

clampLat(val)

source code

returns val standardized as a latitude.

Our latitudes are always in [-pi, pi].

Variables Details

stcSpaceRefFrames

Value:

set(['AZ_EL',
     'BODY',
     'ECLIPTIC',
     'FK4',
     'FK5',
     'GALACTIC_I',
     'GALACTIC_II',
     'GEO_C',
...

stcRefPositions

Value:

set(['BARYCENTER',
     'CoordRefPos',
     'EMBARYCENTER',
     'GALACTIC_CENTER',
     'GEOCENTER',
     'HELIOCENTER',
     'JUPITER',
     'LOCAL_GROUP_CENTER',
...

stcCoordFlavors

Value:

set(['CARTESIAN',
     'CYLINDRICAL',
     'HEALPIX',
     'POLAR',
     'SPHERICAL',
     'STRING',
     'UNITSPHERE'])

stcTimeScales

Value:

set(['ET',
     'IAT',
     'LST',
     'TAI',
     'TCB',
     'TCG',
     'TDB',
     'TDT',
...